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CVE-2021-46976

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: drm/i915: Fix crash in auto_retire The retire logic uses the 2 lower bits of the pointer to the retire function to store flags.

Published Feb 28, 2024EPSS 0.23%

Overview

CVE-2021-46976 is a medium-severity vulnerability. It was published on February 28, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

drm/i915: Fix crash in auto_retire

The retire logic uses the 2 lower bits of the pointer to the retire

function to store flags. However, the auto_retire function is not

guaranteed to be aligned to a multiple of 4, which causes crashes as

we jump to the wrong address, for example like this:

2021-04-24T18:03:53.804300Z WARNING kernel: [ 516.876901] invalid opcode: 0000 [#1] PREEMPT SMP NOPTI

2021-04-24T18:03:53.804310Z WARNING kernel: [ 516.876906] CPU: 7 PID: 146 Comm: kworker/u16:6 Tainted: G U 5.4.105-13595-g3cd84167b2df #1

2021-04-24T18:03:53.804311Z WARNING kernel: [ 516.876907] Hardware name: Google Volteer2/Volteer2, BIOS Google_Volteer2.13672.76.0 02/22/2021

2021-04-24T18:03:53.804312Z WARNING kernel: [ 516.876911] Workqueue: events_unbound active_work

2021-04-24T18:03:53.804313Z WARNING kernel: [ 516.876914] RIP: 0010:auto_retire+0x1/0x20

2021-04-24T18:03:53.804314Z WARNING kernel: [ 516.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/402be8a101190969fc7ff122d07e262df86e132bRefgit.kernel.org/stable/c/608441de3976c526b02af4d7063093c8adf351e3Refgit.kernel.org/stable/c/805c990a9c54b9451d3daff640b850909c31ab9dRefgit.kernel.org/stable/c/f7520970d5353cb1fa4d9089a1b23669c5da97feRefgit.kernel.org/stable/c/402be8a101190969fc7ff122d07e262df86e132bRefgit.kernel.org/stable/c/608441de3976c526b02af4d7063093c8adf351e3Refgit.kernel.org/stable/c/805c990a9c54b9451d3daff640b850909c31ab9dRefgit.kernel.org/stable/c/f7520970d5353cb1fa4d9089a1b23669c5da97fe

How CyberStrike helps

Frequently asked questions

What is CVE-2021-46976?

CVE-2021-46976 is a medium-severity vulnerability. It was published on February 28, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2021-46976?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-46976?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-46976?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-46976 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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